-20.44% is the change from 636 to 506
Calculation steps:
[( 506 - 636 ) ÷ 636] x 100 = -20.44%
Formula
Percentage change = [(506 - 636) / 636] x 100
Subtract the new number by the original number
506 - 636 = -130
-130 ÷ 636 = -0.20440251572327045
-0.20440251572327045 x 100 = -20.44%